因此，研究一种有效的反垃圾邮件系统具有十分重要的意义。
Accordingly, it is significant to explore an effective Anti-Spam system.
当前它的主要作用是帮助hashcash用户避免因为使用了基于内容和基于黑名单的(blacklist -based)反垃圾邮件系统而丢失邮件。
Its main current use is to help hashcash users avoid losing email due to content-based and blacklist-based anti-spam systems.
当前它的主要作用是帮助hashcash用户避免因为使用了基于内容和基于黑名单的(blacklist -based)反垃圾邮件系统而丢失邮件。
Its main current use is to help hashcash users avoid losing email due to content-based and blacklist-based anti-spam systems.
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